This patchset can be fetched from my github:
https://github.com/Damenly/btrfs-progs/tree/lowmem_v5
Patch[1] is added for code shared.
Patch[2-6] introduce two ways to avoid extents overwrite:
1) Traverse trees and exclude all metadata blocks.
It's time-inefficient for large filesystems.
2) Mark all existed chunks full, allocate new chunk for CoW and
records chunk start.
If the last allocated chunk is almost full, allocated a new one.
Method 2 is More efficient than 1. However, it can't handle situations
like no space(fsck-tests/004).
Lowmem repair will try method 2 first and then method 1.
Patch[7-15] remove parameters @trans in functions in lowmem repair.
They try to avoid extents overwrite if necessary and start
transactions by themselves.
Patch[16] adds a test image for new chunks allocation.
Excluding extents can be tested by existed image in fsck-tests/014.
Those patches are mainly for lowmem repair. Original mode is not
influenced.
---
Changlog:
v5->v4:
- Rebase to devel. Bases commit 9c6d390217b8 ("btrfs-progs: check:
Distingusih csum checking output for --check-data-csum")
- Change changelogs and fix typos.
- Rename subjects from "* lowmem check: *" to "* lowmem: *".
v4->v3:
- Remove global enum extents_operation to simplify
avoid_extents_overwrite() and its cleanup.
- Rebase after work of check split.
v3->v2:
- check_btrfs_root() returns FATAL_ERROR if check_fs_first_inode()
failed. Thanks Nikolay Borisov.
- Add function try_to_force_cow_in_new_chunk() and global u64
varaiable to record start of the last allocated chunk.
- Remove unused EXTENTS_PIN in enum lowmem_extents_operation.
v2->v1:
- Let @err in check_btrfs_root() record err bits but excluded
negative values.
- Do not delete a line of code to release path after extent item'
insertion in repair_extent_data_item().
- Add patch[3].
- Force CoW in new allocated chunk to avoid extents overwrite.
- Remove parameters @trans in check_chunks_and_extents_v2() and
related callees.
- Repair functions for lowmem mode call try_avoid_extents_overwrite()
and start transactions.
Su Yue (16):
btrfs-progs: check: move pin_down_tree_blocks to mode-common.c
btrfs-progs: lowmem: exclude extents of metadata blocks
btrfs-progs: lowmem: introduce mark/clear_block_groups_full()
btrfs-progs: lowmem: introduce try_force_cow_in_new_chunk()
btrfs-progs: lowmem: introduce avoid_extents_overwrite()
btrfs-progs: lowmem: exclude extents if init-extent-tree in lowmem
btrfs-progs: lowmem: start to remove parameters @trans in lowmem
btrfs-progs: lowmem: remove parameter @trans of delete_extent_item()
btrfs-progs: lowmem: remove parameter @trans of repair_chunk_item()
btrfs-progs: lowmem: remove parameter @trans of repair_extent_item()
btrfs-progs: lowmem: remove parameter @trans of check_leaf_items()
btrfs-progs: lowmem: remove parameter @trans of repair_tree_back_ref()
btrfs-progs: lowmem: remove parameter @trans of check_btrfs_root()
btrfs-progs: lowmem: introduce repair_block_accounting()
btrfs-progs: lowmem: end of removing parameters @trans in lowmem
btrfs-progs: fsck-tests: add image no extent with normal device size
check/main.c | 118 +---
check/mode-common.c | 141 +++++
check/mode-common.h | 3 +
check/mode-lowmem.c | 539 +++++++++++++++---
.../014-no-extent-info/.lowmem_repairable | 0
.../014-no-extent-info/no_extent.raw.xz | Bin 0 -> 28084 bytes
...default_case.img => no_extent_bad_dev.img} | Bin
7 files changed, 627 insertions(+), 174 deletions(-)
create mode 100644 tests/fsck-tests/014-no-extent-info/.lowmem_repairable
create mode 100644 tests/fsck-tests/014-no-extent-info/no_extent.raw.xz
rename tests/fsck-tests/014-no-extent-info/{default_case.img =>
no_extent_bad_dev.img} (100%)
--
2.17.0
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